Neutron source transport device

Abstract

The present invention relates to a neutron source transport device, which includes an upper guide tube, a support plate, and a lower guide tube. The support plate has a through hole, the lower guide tube is fixed to the lower surface of the support plate, the bottom end of the upper guide tube is aligned with the through hole and communicates with the lower guide tube; a first winding mechanism and a second winding mechanism are provided on the support plate. The first winding mechanism includes a first winding drum around which a first steel wire rope is wound, and the second winding mechanism includes a second winding drum around which a second steel wire rope is wound. A neutron source bearing mechanism is provided in the lower guide tube, and both the first steel wire rope and the second steel wire rope are fixedly connected to the neutron source bearing mechanism. In the neutron source transport device of the present invention, the neutron source is introduced into the neutron source bearing mechanism of the lower guide tube through the upper guide tube, and then the first steel wire rope and the second steel wire rope drive the neutron source bearing mechanism to rise or fall by the rotation of the first winding drum and the second winding drum, so that the neutron source moves up and down. The operation is simple, and the space requirement for the installation of the neutron source is reduced.

Description

Technical Field

[0001] The present invention relates to the field of nuclear reactor equipment, and more particularly to a neutron source transport device. Background Art

[0002] The function of the reactor neutron source is to raise the neutron fluence rate density to a sufficiently high initial level before the reactor reaches criticality, so that the nuclear measuring instruments in the source range can measure the neutron fluence rate density level and its growth rate with better statistical characteristics, and place the entire startup process of the reactor under the supervision of the instruments, thereby ensuring the safety during the startup of the reactor.

[0003] Currently, the neutron sources of known pressurized water reactors and high-temperature gas-cooled reactors are fixedly installed in the reactor in the form of components. For the Thorium Molten Salt Reactor Nuclear Energy System (TMSR), according to the design requirements, the TMSR experimental reactor uses a movable neutron source, and the neutron source is removed from the reactor core after startup. The existing transport device includes a driving mechanism and a wire rope drum structure. The neutron source is suspended at the lower end of a wire rope, and the drum is driven to rotate by the driving mechanism, and then the neutron source moves up and down through the up and down movement of the wire rope.

[0004] However, the existing transport device requires operators to install the neutron source in the upper reactor compartment. Since the installation operation steps of the neutron source are relatively cumbersome, there are many devices in the upper reactor compartment and the layout is compact, resulting in a narrow installation space, which brings great inconvenience to the source loading operation and also poses a potential safety hazard to the operators. Summary of the Invention

[0005] The purpose of the present invention is to provide a neutron source transport device to solve the problems of relatively cumbersome installation operation of the neutron source and difficult installation due to the narrow installation space.

[0006] Based on the above purpose, the present invention provides a neutron source transport device, including an upper guide tube, a support plate, and a lower guide tube. The support plate has a through hole. The lower guide tube is fixed on the lower surface of the support plate. The top end of the upper guide tube is fixed on a safety container, and the bottom end of the upper guide tube is aligned with the through hole so that the upper guide tube is communicated with the lower guide tube. A first drum mechanism and a second drum mechanism are fixed on the support plate. The first drum mechanism includes a first drum, and a first wire rope is wound around the first drum. The second drum mechanism includes a second drum, and a second wire rope is wound around the second drum. A neutron source bearing mechanism is arranged in the lower guide tube, and both the first wire rope and the second wire rope are fixedly connected to the neutron source bearing mechanism.

[0007] Further, the first reel mechanism further includes a first lead screw. The two ends of the first lead screw are respectively installed on two first brackets, and the two first brackets are fixed on the support plate. The first reel is installed on the first lead screw and forms a ball screw structure with the first lead screw. A first guiding and supporting mechanism is fixed on the first lead screw, and the first reel is connected to the first guiding and supporting mechanism, so that the first reel can rotate synchronously with the first guiding and supporting mechanism and slide axially relative to the first guiding and supporting mechanism. The second reel mechanism further includes a second lead screw. The two ends of the second lead screw are respectively installed on two second brackets, and the two second brackets are fixed on the support plate. The second reel is installed on the second lead screw and forms a ball screw structure with the second lead screw. A second guiding and supporting mechanism is fixed on the second lead screw, and the second reel is connected to the second guiding and supporting mechanism, so that the second reel can rotate synchronously with the second guiding and supporting mechanism and slide axially relative to the second guiding and supporting mechanism.

[0008] Further, the first guiding and supporting mechanism includes two first fixing disks and multiple first guiding rods connected between the two first fixing disks. The first guiding rods pass through the first reel, and the first reel can slide relative to the first guiding rods. The second guiding and supporting mechanism includes two second fixing disks and multiple second guiding rods connected between the two second fixing disks. The second guiding rods pass through the second reel, and the second reel can slide relative to the second guiding rods.

[0009] Further, a first resolver is provided on the first bracket for measuring the angular displacement and angular velocity of the first lead screw. A second resolver is provided on the second bracket for measuring the angular displacement and angular velocity of the second lead screw.

[0010] Further, a driving mechanism is further included. The driving mechanism is connected to the first lead screw, and the second lead screw is connected to the first lead screw. The driving mechanism drives the first lead screw to rotate, and the first lead screw drives the second lead screw to rotate synchronously.

[0011] Further, the driving mechanism includes a motor, a speed reducer, and a first gear. The output shaft of the motor is connected to the input shaft of the speed reducer, and the output shaft of the speed reducer is connected to the first gear. A second gear is fixed on the first lead screw, and the second gear meshes with the first gear.

[0012] Further, a third gear is fixed on the first lead screw, and a fourth gear is fixed on the second lead screw. The third gear meshes with the fourth gear.

[0013] Furthermore, a guide assembly is provided on the support plate, and the guide assembly includes a first guide frame and a second guide frame. The first guide frame is provided with a first guide wheel, and the first steel wire rope is wound around the first guide wheel. The second guide frame is provided with a second guide wheel, and the second steel wire rope is wound around the second guide wheel.

[0014] Furthermore, the guide assembly also includes an inner stop block and an outer stop block, the outer stop block is fixed on the support plate, and the inner stop block is fixed on the outer stop block, and both the inner stop block and the outer stop block are provided with through holes, and the through holes of the inner stop block and the outer stop block and the through hole are aligned with each other to form a transport channel for the neutron source, and the first steel wire rope and the second steel wire rope move up and down in the transport channel.

[0015] Furthermore, a support foot that cooperates with the inner stopper is provided at the top end of the upper guide tube, and the support foot is inserted into the through hole of the inner stopper to align the upper guide tube with the through hole.

[0016] The neutron source transport device of the present invention introduces the neutron source into the neutron source carrying mechanism of the lower guide tube through the upper guide tube, and then the first and second steel wire ropes are rotated to raise or lower the neutron source carrying mechanism, thereby causing the neutron source to move up and down. The operation is simple, the space requirement for neutron source installation is reduced, and the personal safety of installation operators can be better guaranteed, so that the neutron source can be better applied to the TMSR molten salt reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a neutron source transport device according to an embodiment of the present invention;

[0018] Figure 2 This is a top view of the neutron source transport device according to an embodiment of the present invention with the upper guide tube removed;

[0019] Figure 3 2. It is a structural schematic diagram of a reel mechanism of a neutron source transport device according to an embodiment of the present invention;

[0020] Figure 4 2. It is a schematic structural diagram of a guide assembly of a neutron source transport device according to an embodiment of the present invention;

[0021] Figure 5 is a structural schematic diagram of a first guide frame of a guide assembly according to an embodiment of the present invention;

[0022] Figure 6 2 is a schematic structural diagram of an upper guide tube of a neutron source transport device according to an embodiment of the present invention;

[0023] Figure 7Schematic diagram of the neutron source transport device according to an embodiment of the present invention for lifting the neutron source carrier mechanism upward;

[0024] Figure 8 Schematic diagram of the neutron source transport device according to an embodiment of the present invention for lowering the neutron source carrier mechanism downward. Detailed implementation manners

[0025] The following combines the accompanying drawings to give a preferred embodiment of the present invention and describes it in detail.

[0026] As Figure 1 and Figure 2 shown, an embodiment of the present invention provides a neutron source transport device, including an upper guide tube 100, a support plate 200, and a lower guide tube 300. The support plate 200 has a through hole 210. The lower guide tube 300 is fixed on the lower surface of the support plate 200. The top end of the upper guide tube 100 is fixed on a safety container (not shown in the figure). The bottom end of the upper guide tube 100 is aligned with the through hole 210 so that the upper guide tube 100 and the lower guide tube 300 communicate with each other through the through hole 210. A first reel mechanism 410 and a second reel mechanism 420 are fixed on the support plate 200. The first reel mechanism 410 includes a first reel 411, and a first steel wire rope 412 is wound around the first reel 411. The second reel mechanism 420 includes a second reel 421, and a second steel wire rope 422 is wound around the second reel 421. A neutron source carrier mechanism 310 is arranged in the lower guide tube 300 for carrying the neutron source 700. Both the first steel wire rope 412 and the second steel wire rope 422 are fixedly connected to the neutron source carrier mechanism 310 to make the neutron source carrier mechanism 310 rise or fall in the lower guide tube 300 by the rotation of the first reel 411 and the second reel 412. When installing the neutron source 700, the neutron source 700 in the safety container enters the upper guide tube 100 and slides downward through the through hole 210 under the action of gravity and then slides to the neutron source carrier mechanism 310 in the lower guide tube 300 to complete the installation of the neutron source. When the neutron source needs to enter the reactor core, the first reel 411 and the second reel 421 are rotated, and the first steel wire rope 411 and the second steel wire rope 412 descend, so that the neutron source carrier mechanism 310 descends and transports the neutron source 700 to a designated position in the reactor core.

[0027] In some embodiments, the neutron source carrier mechanism 310 is a hollow tubular structure, which can cooperate with the structure of the neutron source to fix the neutron source in the neutron source carrier mechanism 310.

[0028] As Figure 3As shown, the first reel mechanism 410 further includes a first lead screw 413. Both ends of the first lead screw 413 are respectively installed on two first brackets 414, and the two first brackets 414 are fixed on the support plate 200. The first lead screw 413 can rotate relative to the two first brackets 414. The first reel 411 is installed on the first lead screw 413 and forms a ball screw structure with the first lead screw 413. When the first lead screw 413 rotates, the first reel 411 will move along the axial direction of the first lead screw 413. A first guiding and supporting mechanism 415 is also fixed on the first lead screw 413. The first guiding and supporting mechanism 415 includes two relatively arranged first fixing plates 4151. A plurality of first guiding rods 4152 are connected between the two first fixing plates 4151. The first guiding rods 4152 pass through the first reel 411, enabling the first reel 411 to slide axially relative to the first guiding rods 4152 but unable to rotate. In this way, when the first lead screw 413 rotates, the first guiding and supporting mechanism 415 will rotate synchronously, thereby causing the first reel 411 to rotate synchronously as well. At the same time, the rotation of the first lead screw 413 will also drive the first reel 411 to slide axially. That is to say, the first reel 411 will rotate and move axially simultaneously. As the first reel 411 rotates, the first wire rope 412 thereon will be wound in (ascend) or unwound (descend). Since the first reel 411 will also move axially while rotating, the position of the wire rope will not change when it is wound in or unwound. That is, when the wire rope is wound in or unwound from the first reel 411, its position remains unchanged relative to other structures except the first reel 411. The second reel mechanism 420 also includes a second lead screw 423, two second brackets 424, and a second guiding and supporting mechanism 425. The second guiding and supporting mechanism 425 includes two second fixing plates 4251 and a plurality of second guiding rods 4252. Their structures are the same as those of the first reel mechanism 410 and will not be elaborated here.

[0029] In some embodiments, the first reel mechanism 410 and the second reel mechanism 420 are symmetrically arranged relative to the through hole 210. The first wire rope 412 and the second wire rope 422 are respectively fixedly connected to both sides of the neutron source bearing mechanism 310, making the neutron source bearing mechanism 310 more stable.

[0030] As Figure 2 and Figure 3As shown, the neutron source transport device may further include a driving mechanism 500. The driving mechanism 500 is connected to the first lead screw 413 to drive its rotation. The driving mechanism 500 may include a motor 510, a speed reducer 520, and a first gear 530. The output shaft of the motor 510 is connected to the input shaft of the speed reducer 520, and the output shaft of the speed reducer 520 is connected to the first gear 530. A second gear 417 may be fixed on the first lead screw 413. The first gear 530 meshes with the second gear 417. In this way, after the motor 510 is decelerated by the speed reducer 520, it can drive the first gear 530 to rotate, and the first gear 530 drives the second gear 417 to rotate. Since the first lead screw 413 is coaxially fixed with the second gear 417, the first lead screw 413 will also rotate together with the second gear 417. The first lead screw 413 drives the first reel 411 to rotate and drives the first reel 411 to move axially. The rotation of the first reel 411 causes the first wire rope 412 to be wound in or out, so that the neutron source bearing mechanism 310 rises or falls.

[0031] In some embodiments, a third gear 418 may also be fixed on the first lead screw 413, as Figure 2 shown. In some embodiments, the first bracket 414 may be provided with two first resolvers 416. A fifth gear 4161 and a sixth gear 4162 are fixed on the shaft of one of the first resolvers 416, and a seventh gear 4163 is fixed on the shaft of the other resolver 416. The fifth gear 4161 meshes with the third gear 418, and the sixth gear 4162 meshes with the seventh gear 4163. In this way, when the first lead screw 413 rotates, the third gear 418 drives the fifth gear 4161 to rotate, so that the shaft of one of the first resolvers 416 rotates. Then, through the cooperation of the sixth gear 4162 and the seventh gear 4163, the shaft of the other first resolver 416 rotates. Thus, the angular displacement and angular velocity of the first lead screw 413 are measured by the two first resolvers 416. Then, the vertical displacement of the first wire rope 412 and the neutron source bearing mechanism 310 can be obtained according to the angular displacement and angular velocity of the first lead screw 413.

[0032] A fourth gear 427 is fixed to the second screw rod 423, and two second rotary transformers 426 may be provided on the second bracket 424. An eighth gear 4261 and a ninth gear 4262 are fixed to the shaft of one of the second rotary transformers 426, and a tenth gear 4263 is fixed to the shaft of the other second rotary transformer 426. The eighth gear 4261 is engaged with the fifth gear 4161, the ninth gear 4262 is engaged with the tenth gear 4263, and the eighth gear 4261 is also engaged with the fourth gear 427. In this way, when the first screw rod 413 During rotation, the third gear 418 rotates together, driving the fifth gear 4161, which in turn drives the eighth gear 4261. The eighth gear 4261 drives the fourth gear 427, which in turn drives the second screw rod 423 to rotate, thereby causing the second screw rod 413 to rotate together with the first screw rod 413. In other words, through this transmission mechanism, the first and second screw rods 413 and 423 can rotate synchronously, thereby achieving the ascent or descent of the neutron source support mechanism 310. The rotation of the eighth gear 4261 also rotates the shaft of one of the second rotary transformers 426, thereby rotating the ninth gear 4262. The ninth gear 4262 in turn drives the tenth gear 4263 to rotate, thereby rotating the shaft of the other second rotary transformer 426. The two second rotary transformers 426 can measure the angular displacement and angular velocity of the second screw rod 423, thereby obtaining the vertical displacement of the second wire rope 422 and the neutron source support mechanism 310.

[0033] Although Figure 2 The figure shows that the first rotary transformer 416 and the second rotary transformer 426 are transmitted between the fifth to tenth gears and the two screw rods. However, in other embodiments, the fifth to tenth gears can be removed, and the first rotary transformer 416 can be directly mounted coaxially with the first screw rod 413, and the second rotary transformer 426 can be directly mounted coaxially with the second screw rod 423, so as to measure the angular displacement of the first screw rod 413 and the second screw rod 423 respectively. In this case, the third gear 418 and the fourth gear 427 can directly mesh with each other, without the need for transmission through the fifth gear 4161 and the eighth gear 4261.

[0034] In some embodiments, the driving mechanism 500 may be mounted on one of the first brackets 414 , and the second gear 417 and the third gear 418 are respectively fixed to both ends of the first screw rod 413 to avoid interference.

[0035] like Figure 4As shown, a guiding assembly 600 may also be provided on the support plate 200. The guiding assembly 600 is arranged around the through hole 210 and is used to guide the first steel wire rope 412 and the second steel wire rope 422 so that they can smoothly enter the lower guiding tube 300. The guiding assembly 600 may include a symmetrically arranged first guiding frame 610 and a second guiding frame 620. A first guiding wheel 611 is installed on the first guiding frame 610, and the first steel wire rope 412 is wound around the first guiding wheel 611. A second guiding wheel 621 is installed on the second guiding frame 620, and the second steel wire rope 422 is wound around the second guiding wheel 621. Thus, the first steel wire rope 412 and the second steel wire rope 422 are respectively guided by the first guiding wheel 611 and the second guiding wheel 621.

[0036] The guiding assembly 600 may further include an inner stopper 630 and an outer stopper 640. Through holes are provided on both the outer stopper 640 and the inner stopper 630. The outer stopper 640 is fixed to the support plate 200 by bolts, and the inner stopper 630 is fixed to the outer stopper 640 by bolts. The through holes of the inner stopper 630 and the outer stopper 640 and the through hole 210 are aligned with each other to form a transport channel for the neutron source 700; the first steel wire rope 412 and the second steel wire rope 422 move up and down in this transport channel. During their up and down movement, the inner stopper 630 and the outer stopper 640 can limit the swaying of the steel wire ropes (i.e., the movement in the radial direction), so that the steel wire ropes move more stably when moving up and down.

[0037] As Figure 5 shown, in some embodiments, a first shaft 612 may be installed on the first guiding frame 610. It is fixed to the first guiding frame 610 by a fastening nut 613. The first guiding wheel 611 is installed on the first shaft 612 and can rotate relative to the first shaft 612. Similarly, a second shaft may be fixed on the second guiding frame 620. The second guiding wheel 621 is installed on the second shaft, and can rotate relative to the second shaft 622. Its structure is the same as that of the first guiding frame 610.

[0038] As Figure 6 shown, in some embodiments, a flange 110 is provided at the top end of the upper guiding tube 100. It is fixedly connected to the safety container through the flange 110; a supporting leg 120 that cooperates with the inner stopper 630 is provided at the bottom end of the upper guiding tube 100. The supporting leg 120 is inserted into the through hole of the inner stopper 630 so that the upper guiding tube 100 is aligned with the through hole 210 and is communicated with the lower guiding tube 300.

[0039] As Figure 7As shown in the figure, when the neutron source carrier mechanism 310 is lifted upward, the motor 510 rotates counterclockwise, the first gear 530 also rotates counterclockwise, the second gear 417 rotates clockwise, the first winding drum 411 also rotates clockwise, the first steel wire rope 412 rises, the second winding drum 421 rotates counterclockwise, the second steel wire rope 422 rises, and the first steel wire rope 412 and the second steel wire rope 422 lift the neutron source carrier mechanism 310. As Figure 8 shown in the figure, when the motor 510 rotates clockwise, the first gear 530 also rotates clockwise, the second gear 417 rotates counterclockwise, the first winding drum 411 rotates counterclockwise, the first steel wire rope 412 descends, the second winding drum 421 rotates clockwise, the second steel wire rope 422 descends, and the first steel wire rope 412 and the second steel wire rope 421 lower the neutron source carrier mechanism 310.

[0040] In the neutron source transport device according to the embodiment of the present invention, the neutron source 700 is introduced into the neutron source carrier mechanism 310 of the lower guide tube 300 through the upper guide tube 100, and then the first steel wire rope 412 and the second steel wire rope 422 drive the neutron source carrier mechanism 310 to rise or fall by the rotation of the first winding drum 411 and the second winding drum 421, so that the neutron source 700 moves up and down. The operation is simple, the space requirement for the installation of the neutron source is reduced, the personal safety of the installation operator can be better guaranteed, and it can be better applied to the TMSR molten salt reactor.

[0041] The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Various changes can be made to the above embodiments of the present invention. That is, all simple, equivalent changes and modifications made according to the claims and the content of the specification of the present invention application fall within the scope of the claims of the present invention patent. The content not described in detail in the present invention is all conventional technical content.

Claims

1. A neutron source transport device, characterized in that, It includes an upper guide tube, a support plate, and a lower guide tube. The support plate has a through hole. The lower guide tube is fixed to the lower surface of the support plate. The top end of the upper guide tube is fixed to the safety container, and the bottom end of the upper guide tube is aligned with the through hole so that the upper guide tube communicates with the lower guide tube. A first reel mechanism and a second reel mechanism are fixed to the support plate. The first reel mechanism includes a first reel around which a first steel wire rope is wound. The second reel mechanism includes a second reel around which a second steel wire rope is wound. A neutron source carrier mechanism is provided in the lower guide tube, and both the first steel wire rope and the second steel wire rope are fixedly connected to the neutron source carrier mechanism.

2. The neutron source transport device according to claim 1, wherein The first reel mechanism further includes a first lead screw. The two ends of the first lead screw are respectively installed on two first brackets, and the two first brackets are fixed to the support plate. The first reel is installed on the first lead screw and forms a ball screw structure with the first lead screw. A first guiding and supporting mechanism is fixed to the first lead screw, and the first reel is connected to the first guiding and supporting mechanism so that the first reel can rotate synchronously with the first guiding and supporting mechanism and slide axially relative to the first guiding and supporting mechanism. The second reel mechanism further includes a second lead screw. The two ends of the second lead screw are respectively installed on two second brackets, and the two second brackets are fixed to the support plate. The second reel is installed on the second lead screw and forms a ball screw structure with the second lead screw. A second guiding and supporting mechanism is fixed to the second lead screw, and the second reel is connected to the second guiding and supporting mechanism so that the second reel can rotate synchronously with the second guiding and supporting mechanism and slide axially relative to the second guiding and supporting mechanism.

3. The neutron source transport device according to claim 2, characterized in that, The first guiding and supporting mechanism includes two first fixed disks and multiple first guiding rods connected between the two first fixed disks. The first guiding rods pass through the first reel, and the first reel can slide relative to the first guiding rods. The second guiding and supporting mechanism includes two second fixed disks and multiple second guiding rods connected between the two second fixed disks. The second guiding rods pass through the second reel, and the second reel can slide relative to the second guiding rods.

4. The neutron source transport device according to claim 2, characterized in that, A first resolver is provided on the first bracket for measuring the angular displacement and angular velocity of the first lead screw. A second resolver is provided on the second bracket for measuring the angular displacement and angular velocity of the second lead screw.

5. The neutron source transport device according to claim 2, characterized in that, It further includes a driving mechanism. The driving mechanism is connected to the first lead screw, and the second lead screw is connected to the first lead screw. The driving mechanism drives the first lead screw to rotate, and the first lead screw drives the second lead screw to rotate synchronously.

6. The neutron source transport device according to claim 5, wherein, The driving mechanism includes a motor, a reduction gearbox, and a first gear. The output shaft of the motor is connected to the input shaft of the reduction gearbox, and the output shaft of the reduction gearbox is connected to the first gear. A second gear is fixed to the first lead screw, and the second gear meshes with the first gear.

7. The neutron source transport device according to claim 6, characterized in that, A third gear is fixed on the first lead screw, and a fourth gear is fixed on the second lead screw. The third gear meshes with the fourth gear.

8. The neutron source transport device according to claim 1, characterized in that, A guiding assembly is arranged on the support plate. The guiding assembly includes a first guiding frame and a second guiding frame. A first guiding wheel is installed on the first guiding frame, and the first steel wire rope is wound around the first guiding wheel. A second guiding wheel is installed on the second guiding frame, and the second steel wire rope is wound around the second guiding wheel.

9. The neutron source transport device according to claim 8, characterized in that, The guiding assembly further includes an inner stopper and an outer stopper. The outer stopper is fixed on the support plate, and the inner stopper is fixed on the outer stopper. Through holes are provided on both the inner stopper and the outer stopper. The through holes of the inner stopper and the outer stopper and the through hole are aligned with each other to form a transport channel for the neutron source. The first steel wire rope and the second steel wire rope move up and down in the transport channel.

10. The neutron source transport device according to claim 9, characterized in that, The top end of the upper guiding tube is provided with a supporting leg that cooperates with the inner stopper. The supporting leg is inserted into the through hole of the inner stopper so that the upper guiding tube is aligned with the through hole.

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